<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item, index) in leveList" v-if="item.meta.title" :key="item.path">
        <span v-if="item.redirect==='noredirect' ||  index==leveList.length-1" class="no-redicrect">{{item.meta.title}}</span>
        <a v-else @click.prevent="handLink(item)">{{item.meta.title}}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
import pathToRegexp from 'path-to-regexp'
export default {
  name: 'Breadcrumb',
  data() {
    return {
      leveList: null
    }
  },
  created () {
    this.getBreadcrumb()
  },
  watch: {
    $route() {
      this.getBreadcrumb()
    }
  },
  methods: {
    getBreadcrumb() {
      let matched = this.$route.matched.filter(item => {
        if (item.name) {
          return true
        }
      })
      const first = matched[0]
      if (first&&first.name.trim().toLocaleLowerCase() !== 'home') {
        matched = [{path: '/home', meta: {title: '首页'}}].concat(matched)
      }
      this.leveList=matched
    },
    pathCompile(path){
      const {params} = this.$route
      let toPath = pathToRegexp.compile(path)
      return toPath(params)
    },
    handLink(item) {
      const {redirect, path} = item
      if (redirect) {
        this.$router.push(redirect)
        return
      }
      this.$router.push(this.pathCompile(path))
    }
  }

}
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 10px;
  .no-redicrect {
    color: #97a8be;
    cursor: text;
  }
}
</style>
